Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 423487
Title Carboxylates and the uptake of ammonium by excised maize roots
Author(s) Breteler, H.
Source Landbouwhogeschool Wageningen. Promotor(en): A.C. Schuffelen. - Wageningen : Pudoc - ISBN 9789022005705 - 99
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1975
Keyword(s) assimilatie - experimenten - in vitro - maïs - stikstof - organische verbindingen - fosfor - plantenfysiologie - planten - zwavel - zea mays - assimilation - experiments - maize - nitrogen - organic compounds - phosphorus - plant physiology - plants - sulfur
Categories Maize
Abstract The effect of carboxylates (organic acid anions) on NH <sub><font size="-1">4</font></sub> uptake was studied by changing the carboxylate level of roots prior to uptake experi ments. Succinate was the most effective stimulator of ammonium uptake. The oxocarboxylates (α-oxoglutarate, oxaloacetate and pyruvate) and malate also promoted NH <sub><font size="-1">4</font></sub> entry. Preloading of roots with citrate, acetate, oxalate, glyoxylate or malonate reduced subsequent ammonium uptake. It is concluded that oxocarboxylates are important compounds in both the assimilation and the uptake process of ammonium. All carboxylates tested enhanced K uptake, but repressed NO <sub><font size="-1">3</font></sub> uptake, except citrate which increased nitrate absorption. Carboxylate stimulation of NH <sub><font size="-1">4</font></sub> entry showed metabolic as well as non-metabolic aspects.
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